1, very light load use
Generally, the module power supply has a minimum load limit, which varies from manufacturer to manufacturer. It is generally about 10%. Because the load is too light, the current-carrying component will be discontinuous, and the current will be discontinuous, resulting in unstable output voltage. This is caused by the power supply itself. The working principle is determined. But what if the user does have light load or even no load? The most convenient and effective method is to add a certain dummy load, which is about 2% of the output power. It can be preset by the module manufacturer before leaving the factory. The user installs an appropriate resistor outside the module as a load. It is worth noting that if you choose the former, the module efficiency will be reduced. However, some circuit topologies do not have a minimum load limit. For example, Dingli's E-series module power supply can meet the normal use of the user from no load to full load.
2, multiple output power distribution
Pay attention to the power distribution between the different output when selecting the power supply of the multi-output module. Take two-way products as an example. There are generally two types: one is a two-way balanced load, that is, the two-way current is the same size; the other is an unbalanced load, that is, the main and auxiliary road load currents are different, and the main road is large. The auxiliary road is small. For this kind of product, it is recommended to choose the ratio of the auxiliary road to the main road power is 1/5~1/2. In this range, the voltage stability of the auxiliary road is guaranteed (can be within 5%), otherwise the auxiliary circuit voltage will be High or low. On the other hand, if the two-way load is different, try not to use the balanced load module power supply because the power supply is designed for the symmetrical load. If the load is unbalanced, the auxiliary circuit voltage accuracy is not high.
3, try to reduce the temperature rise of the module power supply
The operating temperature of the internal components of the module directly affects the life of the module power supply. The lower the device temperature, the longer the module life. Under certain working conditions, the loss of the module power supply is certain, but the temperature rise of the module power supply can be improved by improving the heat dissipation condition of the module power supply, thereby greatly extending the service life. For example, a module power supply of 50W or more must be equipped with a heat sink. The larger the surface area of ​​the heat sink, the better the heat dissipation, and the installation direction of the heat sink should be as favorable as possible for the natural convection of the air. The power can be installed above 150W in addition to the heat sink. The fan is forced to air. In addition, in places with high ambient temperature or poor air circulation conditions, the module must be derated to reduce power consumption and reduce temperature rise and extend service life.
4, reasonable installation to reduce mechanical stress
The module power supply is drawn by metal pins, and the module power supply and external circuit, metal pin and module power supply internal circuit are connected by soldering. In some special occasions, the mechanical vibration intensity is large, especially the high-power module power supply is also equipped with a heat sink, which is more serious. Although the thermal insulation rubber inside the module power supply can generally protect the components from buffering, the solder joints may not withstand strong vibration stress and break, resulting in failure of the module power supply. At this time, it must be based on soldering. Then take additional fixing and cushioning measures. For example, you can use a clamp or bolt (for a screw-hole module) to fix the module to a component with a relatively high vibration resistance such as a chassis or a large circuit board, and pad some elastic material between them to cushion The stress generated by vibration.
In short, the module power supply and other components are only carefully selected and properly applied to maximize the performance, reliability is fully guaranteed, and the module power supply will be more widely used!
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